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avformat/sbgdec: Check that end is not before start 

Fixes: signed integer overflow: -9223372036854775808 + -5279949906739200 cannot be represented in type 'long'
Fixes: 26908/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-6329610851319808

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 9ef60a66f1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-10 00:04:50 +01:00
parent 04f802e729
commit a0c75b800f
1 changed files with 5 additions and 0 deletions
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5
libavformat/sbgdec.c
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@ -1414,6 +1414,11 @@ static av_cold int sbg_read_header(AVFormatContext *avf)
if (r < 0)
goto fail;
if (script.end_ts != AV_NOPTS_VALUE && script.end_ts < script.start_ts) {
r = AVERROR_INVALIDDATA;
goto fail;
}
st = avformat_new_stream(avf, NULL);
if (!st)
return AVERROR(ENOMEM);